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Showing 1 to 19 of 19 for “"SeaWinds"”.
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Polar Sea Ice Mapping for SeaWinds
… of sea ice mapping algorithms for the SeaWinds scatterometer. First, an in-depth analysis of the Remund Long (RL) algorithm for SeaWinds is performed. From this study, several improvements are made to the RL algorithm which enhance its performance. In addition, a new method for …
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Seawinds Radiometer Brightness Temperature Calibration And Validation
The NASA SeaWinds scatterometer is a radar remote sensor which operates on two satellites; NASA's QuikSCAT launched in June 1999 and on Japan's ADEOS-II satellite launched in December 2002. The purpose of SeaWinds is to provide global measurements of the ocean surface wind vector. On QuikSCAT, a …
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A Field-Wise Retrieval Algorithm for SeaWinds
… of 1999 NASA will launch the scatterometer SeaWinds, beginning a 3 year mission to measure the ocean winds. SeaWinds is different from previous spaceborne scatterometers in that it employs a rotating pencil-beam antenna as opposed to fixed fan-beam antennas. The scanning beam provides …
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High Resolution Wind Retrieval for SeaWinds on QuikSCAT
… improved the resolution wind estimates from SeaWinds data. This thesis presents the development of three key portions of the high resolution wind retrieval algorithm: Compositing individual σ-0 measurements and Kp, Retrieved wind bias correction, and ambiguity selection for high resolution …
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An Implementation of Field-Wise Wind Retrieval for Seawinds on QuikSCAT
… for field-wise wind retrieval for the SeaWinds scatterometer on the QuikSCAT satellite.</p> <p>Due to its sophistication, field-wise wind retrieval adds computational complexity and intensity. The tradeoffs necessary for practical implementations are examined and quantified. The …
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A Wind and Rain Backscatter Model Derived from AMSR and SeaWinds Data
The SeaWinds scatterometers aboard the QuikSCAT and ADEOS II satellites were originally designed to measure wind vectors over the ocean by exploiting the relationship between wind-induced surface roughening and the normalized radar backscatter cross-section. Recently, an algorithm for …
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Melt Detection and Estimation in Greenland Using Tandem QuikSCAT and SeaWinds Scatterometers
… radar backscatter measurements from the SeaWinds on QuikScat (QuikScat) and SeaWinds on ADEOS-2 (SeaWinds) scatterometers are used to classify the melt state and estimate melt severity in Greenland. Backscatter measurements are organized into high temporal and high spatial resolution …
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An Analysis of SeaWinds Simultaneous Wind/Rain Retrieval in Severe Weather Events
Scatterometers, such as SeaWinds, can provide wide coverage of ocean surface winds. They estimate near-surface wind vectors by relating measured radar backscatter to a geophysical model function. However, SeaWinds measurements are also sensitive to rain, and conventional wind retrieval degrades in …
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Frequency Estimation of Linear FM Scatterometer Pulses Received by the SeaWinds Calibration Ground Station
The SeaWinds Calibration Ground Station (CGS) is a passive ground station used to receive and sample transmissions from the SeaWinds scatterometer. During post processing, the received transmissions are characterized in order to verify proper instrument operation and to eliminate error in satellite …
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Wind Scatterometry with Improved Ambiguity Selection and Rain Modeling
Although generally accurate, the quality of SeaWinds on QuikSCAT scatterometer ocean vector winds is compromised by certain natural phenomena and retrieval algorithm limitations. This dissertation addresses three main contributers to scatterometer estimate error: poor ambiguity selection, estimate …
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A New Method for Melt Detection on Antarctic Ice-Shelves and Scatterometer Calibration Verification
… radar backscatter measurements from the SeaWinds on QuikScat scatterometer and microwave radiometer measurements from the Special Sensor Microwave/Imager (SSM/I) are used to determine periods of surface melt and freeze in the Antarctic ice-shelves. The normalized radar backscatter …
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Observation and Tracking of Tropical Cyclones Using Resolution Enhanced Scatterometry
… of every tropical cyclone worldwide observed by Seawinds on QuikSCAT or SeaWinds on ADEOS II from 1999 through 2005 is generated and made available to the scientific community at http://scp.byu.edu.
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Satellite Scatterometers: Calibration Using a Ground Station and Statistical Measurement Theory
… methodology is established for calibration of SeaWinds, NASA's current scatterometer, using a receive-only ground station. Principles of the methodology are implemented, new analysis techniques developed, and important results obtained for instrument timing, frequency, power, position, and …
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An Ocean Surface Wind Vector Model Function For A Spaceborne Microwave Radiometer And Its Application
… data set of coincident measurements between the SeaWinds scatterometer and the Advanced Microwave Scanning Radiometer (AMSR). AMSR observes the vertical and horizontal brightness temperature (TB) at six frequency bands between 6.9 GHz and 89.0 GHz. Although these measurements contain some wind …
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Multisensor Microwave Remote Sensing in the Cryosphere
… algorithms are adopted for current SeaWinds scatterometer data sets. Finally, the automated inversion of large-scale forward electromagnetic scattering of models is considered and used to study the temporal evolution of the scattering properties of polar sea ice.</p>
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A Methodology for the Design of Spaceborne Pencil-Beam Scatterometer Systems
… are developed and used in the design of the SeaWinds instrument - NASA's first pencil-beam scatterometer. Further, the theoretical framework presented in this study is used to propose new scatterometer techniques which will significantly improve the spatial resolution and measurement accuracy …
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Microwave Remote Sensing of the Greenland Ice Sheet: Models and Applications
… the Special Spectral Microwave Imager (SSM/I), SeaWinds on QuikSCAT (QSCAT), and ERS. A new method of melt detection is introduced that is based on a simple physical model relating the moisture content and depth of a layer of wet surface snow to a single channel melt detection threshold. The …
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Microwave Remote Sensing of Saharan Ergs and Amazon Vegetation
… (NSCAT), the ERS scatterometer (ESCAT), the SeaWinds scatterometer aboard QuikScat (QSCAT), and the Precipitation Radar (TRMM-PR) aboard the Tropical Rain Monitoring Mission (TRMM) are used to model the backscatter response from sand dunes. Backscatter incidence and azimuth angle variation …
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The load[ing] city: Navigating layers of accumulation, movement and access in Muizenberg, Cape Town
… contrast, with settlements including Capricorn, Seawinds and Lavender Hill along its eastern edge, showcasing an apartheid-inherited fabric of division. Despite it being an area where both mountain and terrestrial waters meet the sea, Muizenberg is a site of both potential social and ecological …